VIII. REQUIREMENTS 



255 



ances for domestic animals/ The follo\\'ing data dealing with the recom- 

 mendations for vitamin D are taken from these reports. 



In Table XI are given the recommended daily amounts in international 

 units of vitamin D for the maintenance of chickens of various weights and 

 for laying and breeding. The recommended amounts of vitamin D per pound 

 of feed for starting chicks (0 to 8 weeks), growing chicks (8 to 18 weeks) 

 laying hens, and breeding hens are 180, 180, 450, and 450 A.O.A.C. units, 

 respectively. For turkey poults, growing turkeys, and breeding turkeys, 

 800 A.O.A.C. units of vitamin D per pound of feed is recommended. 



The recommended daily amounts of vitamin D, in international units, 

 for various weights of market swine and for breeding stock are given in 



TABLE Xl" 

 Recommended Daily Allowances'' of Vitamin D for Chickens 



Adapted from Recommended Nutrient Allowances for Poultry: A Report of the Committee on 

 Animal Nutrition, National Research Council. 

 International units per animal. 



Table XII The quantity of A'itamin D per pound of feed recommended for 

 all types of swine is 50 I.U. 



The daily allowances of vitamin D for dairy cattle are again based on 

 body weight. For heifers weighing 50, 100, 150, and 200 pounds, the rec- 

 ommended amounts are 200, 400, 600, and 800 I.U., respectively. The 

 allowances per pound of feed for dairy heifers weighing 50, 100, 150, and 

 200 pounds should be 220, 200, 150, and 130 I.U., respectively. No rec- 

 ommendations are made for heavier animals. 



No general recommendations are made regarding the needs of beef cattle 

 for vitamin D. It is pointed out that usually these animals receive suffi- 



* Committee on Animal Nutrition, Recommended Nutrient Allowances for Domes- 

 tic Animals: No. I, Recommended Nutrient Allowances for Poultry (Revised 

 1950); No. II, Recommended Nutrient Allowances for Swine (Revised 1950) 

 No. Ill, Recommended Nutrient Allowances for Dairy Cattle (Revised 1950) 

 No. IV, Recommended Nutrient Allowances for Beef Cattle (Revised 1950) 

 No. V, Recommended Nutrient Allowances for Sheep (Revised 1949); No. VI, 

 Recommended Nutrient .Allowances for Horses (1949). 



